The rarity is that very few copies ever existed of a standalone boxed SMB.
Not every console came with SMB. One very early package didn't have it, and one later package included SMB3 instead. So SMB was sold as a standalone for these cases, but very few units were needed or extant.
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The rarity is that very few copies ever existed of a standalone boxed SMB.
Not every console came with SMB. One very early package didn't have it, and one later package included SMB3 instead. So SMB was sold as a standalone for these cases, but very few units were needed or extant.